Position indicator for micrometer calipers and gauges



Dec. 6, 1932. R R 1,890,404

PQSITION INDICATOR FOR MICROMETER CALIPERS AND GAUGES Filed Nov. 20. 1922;:

3&1 I f Gnu/awn.

Patented Dec. 6, 1932 -1 UNITED 'ST'AT i GEORGE J. mnnnoox, OF-NEWARKQN W JERSEY;

rosrrron mnrn'iionfron Imogenrna (gimme :Ann onions 1 1 15;

Application filedNovemb'er 20, 192 s: Serial 320515;;

This'invention relates to aposition' indicator for use on m1crometer1 calipers, depth gauges and the like,' the rimary object of thedjevice heing to save time, especially in rough- 5 ing out work; and to" provide a safeguard against errors which often occur when themechanic reliessolely 'upon reading the graduations.

A further object'is'to provide an indicator which is particularly usefulwlierelarge nu'mg bers of articles of the same size are to beinspected, the c'onstructionof the device being such that, after it'has oricebeen set, it cannot easily be shiiited out'of proper position 5 successive inspections.

Afurther ob ect is to p of position indicator wh ch can'be applied readilyto micrometer calipers already in use, the said indicator being so shaped as to facil. itatereading of th'e'gr-aduations without ob-' scuring any ofthein to an objectionableezitent." j i. y

3A stilljurther object'isto'provide a position indicator which' when not in use, islo Gated where it is outoftheway. 1

l/Vithfthe foregoing and other objectsin' viewwhich will appear as the description pro.- ceeds the invention.resides in'the Combination and arrangement of parts and in the details v of construction" hereinafter described and claimed it being understood that changesin the precise embodiment of the inventionhere in dis closedmay he made within the scope of what is claimed without" departing; from the l spirit of'the invention;

In the accoinpanyin drawing the preferred form of the inventionhas.been shown; In sa ddrawing,

Fignre 1 is aside elevation of a micrometer 40 caliper showing the position indicator there-V on set for aread ng of onehnndred seventyp tongue 12hav1ngianinw'ardly extendedzknife 7' five thousandths ofan inch.

Figure 2 is a plan view of'the structure I p i ing into and adapted to slide along the groov 10." Thus the ring when applied tofthehub :3, will'he held against rotation thereon-a1} .tho'ughfree to slide longitudinally of the shown in Figure 1. l Figure 3 is an enlarged side elevation of the positionindicator.

3 Figure 4 is a face view thereof. 2 i Figure 5 is a top plan view; l a V Referringto the' figures by characters of 59 referencal designates the yoke or frame of These graduations can be' 'designate provide'a simple'form .annular series of 'indicatingnumera s rang- V amicrometerialiperiof standard construe} tionfthis frame heing provided at one 'end v with an anvil*2 while extending. from 'fits otherfend isj the "usual in swhichfl is mounted thespinjdle'j The sle'eve oif -thifnj ble 5 am unted-101 thehubsand'carrieslthei "1 usualratchet stoplThepperation oif a V micrometer caliper suchijas' shown and fde- T scrihedis' well known to those skilledinifthe art.- 1 That end' of thesleevef' or 'thiinhle t') f nearest the frame I istapered to an edge as shown atu7'and provided/with ar -{annular series of graduations. indicated generally. atB for designating "thousandths 'of an 4 inch. y an ing: from O t FQQl so that one complete rotation of V the sleeve or thimble fr )nj 03? f to O will; measure twenty fiveijonefthousandths offan' inch. 1 This 1 complete "rotation of the sleeve on the hiihwill movetthe edgeof thesleeve froin onett'o another of a lirigg'i tudi-nal series of graduations 9 formedonu the hub 3, the distanee l0etweei'iQevery two adjoining graduations heing adapted, to-

Vme'asure twenty five one thousandths Off an inch. Thefirst of."the ,graduaftionsf9 can-b indicated byfthej character O; whilej very j a fourth I graduation can befdjes'ign'ated y huff meralsindidating from one i ihundred to ten so a hundred: oneflthousandths of an a groove 10 is extendedlongitudinally withinif r the hub 3; alongfthe haw-r the graduations "lheQpQsiti'on indicator conSti uting the present lIIVGIIiIIOII is 'in the form of a [split ring of steel or other "suitable strongv resilient" I jinaterialand has heenillustratedonganeni larged scalefinEig i res' 351 i," and 5. T 1s. indicator [ring 115 of a width'equal tonne hundred o'ne-thousandths of an and: is r d d indt at n le prov" a edgeor projectionli'l at itsfterminal extendwreaks-w d forcibly byhand. Itwill gri .ratcl1et stop 6. Instead, when the'sleeve comes against the ring the ratchet stop will rotate freelywithout feeding the sleeve. The

use of a ratchet stop is'commo'n in the micrometer gauge art. a Y The other end of the ring has a head 14 extendingthe full width of the ring or one hundred one-thousandths ot an inch! The side edges. of thishead are beveledso as to converge away from the hub, one of these beveled edges, 15, constitutingastop forene gage'mentwith thegraduated edgegot the sleeve 5, The tongue. 12 is twentyefive onethousandths of an inchin width'so thatiitf evenly covers the distance from onegradua tlQII'Q to the next adjoiningjone; Theedges of the tonguef12 are beveled and; that edge 16 as; thus to igivefa 'clear space between the eftongu Q h th liilnble s in eng g m nt with 'th in I 'Itl'mightbe stated that the extreme'vvidth of the position} indicator is such that, when it is injposition against the adjacent end of 36; V l on the-hub 3 .so 'as not toobscu're' eltherv of them; 'flAs a .matterof'fact that edge of the i ,the frame 1, it willnot prevent the graduated edge of thesleeve'or thi-mble 5 from being brought tothe ,0? graduation on the hub lnfother w'ords; it does not interfere with the complete closing of they -micrometer 'al p' rured' 'jcircum ferentially j of the 1 hub 3 as to rest between the tenths graduations provided 1 head 14 nearest-theltongue 12, isset back i j I using maximumwidth' ofithe position indicator is V i on.

afhard steel rod from one hundred seventy J five .one thousandths ot an inch in diameter It win be noted indicator extending .overthe graduations 17 is; reduced in width as shown ;at .18 thereby to. be spaced from the graduated edge of the thimble'. .5 to facilitate accurate i fitty one-gthousandths above- -theultimate dimension to be obtained 1 Inother words in- Steadof placingit initially at the one hun- I15 Where the Work is to be reducedto onehundred r 'twenty-five, one-thousandthstof an inch, the position. indicator can be placed'at the one hundred '.seventy-five thousandthi graduationg and the Work roughed out to this }din 'ameter. Thereafter the position indicator xca n be set accurately-to the; one'hundred v sleeve for rea e;-

this can pliedto'thehub 3 of astandard micrometer caliper by unscrewing-the,sleeve or thimble 5,, slipping the position indicator on to the;

and than replacing said: sleeveorthimblei When the position indicator'isarranged against theendofthe frame lit will not inter ere with the complete closing of the migrometer caliper because the extreme or less, than the distance betweenthef frame 1 "and,the 0 graduation 'onthe'hub' v Assuming thatitis desired to grind down 7 tof one hundred twenty-five one-thousandths 1 of an inch inndiameter, the calipenisfplaced in the palm of the handafter it hasnbeen approximately two .one-ithousandths of an "the'head' l ii. V a 7 Under some conditions the position indi work and, by means ofthe'thulnb and second opened a suflicient distance to receive the finger, the positiony indicator can be moved 7 along thehub S-until the edge of the tongue 12 is brought to a point fifty one-thousandths of aninchbelow the. one hundred twenty-five thousandth graduationto which the work is to be produced. As the reading edge of the head 14 is fifty one-thousandths of an inch.

when the 'graduated edge of-the sleeve or thimble 5 comes againstlthe head 14 the correct measurement of one hundred twentyfive thousandths' will be made. between {the anvil Q'andthe spindle'LfAtter the po ition'indicator has thus been accurately arfrang'ed on the liu'bfithe micrometer caliper canbe set against the work by-rotating the ratchet stop Sand by looking at the relative positions .of thgefhead j14;:and the graduated edge of the sleeveior thimble 5, the workman or Other person can readily determine 1 whether or not the work has' been reduced to anywhere near the nltimate diameter, Thus' veryrapid measurements can bejtaken and this is particularly advantageousin roughing but the work. f During the final grinding or A cuttingof theworkthesleeveorthimble 5 I Can be adjusted against the stop 1 4 and whilej I p might accidentally. be rotated b-ackwardly The -head 14L is of su-chflength when meas- (thim'ble or sleeve against'lthe-stop by means {ofthe' ratchet stop 6 will cause, the spindle away therefrom, any reidj ustmentof the ei-to; come to a stop at the proper point durthough. the micrometer caliper'flshould be moved accidentally away fromiset position it could always be returned 'accurately to proper position by rotating the ratchet stop 6 until-.thesleeveor thimble 5'comes against Y cator'canbe placed-at. a point twenty-fiveor dred twenty-five thousandth; graduation,

twentyefive one-thousandth graduation and the work out down accurately to that dimens ong stood that it can also-beused with micrometer depthgauges. and similar devicesl i What is claimed is: i 1. The comblnation with a micrometer caliper or the like having a hub provided with a longitudinal series of graduations, of a split ring embracing and frictionally engaging the hub, a graduated thimble having a. screw feedand adapted, when rotated by hand, to

7 move longitudinally alongthe hub and thrust against the ring to adjust the ring, and a hand operated ratchet stop for feeding the thimble,

said ring gripping the hub with sufficient pressure to constitute a stop for the thimble when actuated by'the ratchet stop.

2. The combination with a micrometer caliper or the like having a hub provided with a longitudinalseries of graduations, of'a split ring embracing and frictionally engaging the hub, cooperating means on the hub, and

.ring for holding the ring against rotation without interfering with the sliding of the ring, a graduated thimble having a screw feed andadapted, when rotated by hand,

to move longitudinally along the hub and thrust against the ring to adjust the ring, and a hand operated ratchet stop for feeding. the thimble, said ring gripping the hub with sufficient pressure to. constitute a stop for the thimble when actuated by the ratchet stop.

3. The combination with a micrometercaliper or the like having a hub provided with a longitudinal series of graduations, a

thimble rotatable on the hub to feed the thimble longitudinally of the hub, said thimble having an annular series of graduations, and

" a ratchet stop foractuating the thimble, of

means constantly gripping'the hub but adj ustable along the hub by the pressure of the thimble'thereagainst when operated inde pendently of the ratchet stop, said means lmiting the rotation of the sleeve or thiinble when actuated by the ratchet stop, and inter-- I fitting cooperating means upon the hub grip.-

Cir

ping means and the hub for holding the said hub grlpping means against rotation on the hub. 1 V 4. The combination with the hub of amicr'ometer caliper or the like, said hub having a longitudinal series of graduations, a thimble mounted for rotation on the hub and having an annular series of graduations extending to one edge, and a ratchet stop for rotating the thimble, of a position indicator including a resilient split ring gripping the hub' and adjustable longitudinally thereof by the rotation of the thimble independently of the.

ratchet stop and against the ring, a tongue at one end of the. ring, a headat the other end of the ring, one edge of the head constituting a means for engagement by the said edge of the thimble when actuated by the ratchet stop thereby to constitute a stop for the thimble,

that edge of the tongue nearest the thimble being set back from the line ofthe corresponding edge of the head.

5. The combination with-the hub of a mible being set back'from the line of sponding edge of the head. i

crometer. caliper or the like said hub having a longitudinal series of graduations,athimble mounted for a rotation on the hub and having an annular series of 'graduations extending to one edge, and a ratchet stop for actuating the thimble, of a position indicator; 1

including a resilient split ring gripping said hub and adjustable longitudinally of the hub by th'elrotation of'the thimblethereagainst independently of the ratchet stop, a tongue at one end of the ring, a head at the other. end of thering, one edge of-the head eonstitutinga means for engagement by the said edge of the I thimble when operated by the f ratchet stop to constitute a stop for the thimble,.that edge f ofthetongue nearest the thimb-le being fset back from the line oftheitop edge-of the head a distance equal to'a predetermined number of gradu-ationsqon the-hub, said ton'gueibeing of a width'equalto thedi's'tance betweentwo adj Oininggraduations, thereby to leave" all graduationsexposed when the position indicator is set-.

ble mounted for rotation on the hub and hav- 6.-Thetcombinationwith the-hubof mi-i crometer caliper or the like, said hub having a longitudinal series of graduations athiming an annular series' of graduations extending to one edge, and arat'chet stopforrotating the thimble, ofa.position'indicator'inby the rotation of the thimble thereagainst in dependently of the: ratchet stop, a tongue at one end of the ring, a head at the other end a of the ring, one edge ofthexhead constituting j cluding a resilient split-ringjgripping the hub and adjustable longitudinally ofthehub a means for engagement by the said. edge of the thimble to constitute a stop for thethimble when the thimble is operatedby the I ratchet stop, there being a longitudinal groove in the hub, and means on the tongue for sliding engagement with the groove to hold the position indicator against rotation.

7. The combinationwith the hub of, amicrometer caliper or the like, said hub having a longitudinal series of graduations,'and a thimble mounted for rotation onfthe hub for engagement by the said edgeof the thim- I ble, that edge of the tongue nearest the thimthe corre- 8. Thecombinationwith the hub of ini crometer caliper orl thelike, said hub having alongitudinal series of graduations, and a thimble mounted for rotation on thehub having an annular series ofgraduation's extending to one edge, of a positionindioator I including a resilient split ringgrippingand adjustable longitudinally ofthe hub by the rotation of the thimble thereagainst, said ring affording limited resistanee to themove 'ment of the'thimble, a tongue atone endof the ring, a head'at the other end of the ring,

' edge Ofthe head a distance equal to: a I 7 predetermined number of graduations' on the hub, said tongue 'beingof a Widthequal to thej :distance ;-1betWeen tWo adjoining 5 graduationgi thereby to leave all xgraduations exposed when the position indicator is set. 9. !The combination withthe hub of a ini-V' one edge ofthe headconstituting a means for v engagement by the said edge of the thimble, that edgeof the tongue nearest the thimble being set back from the line lof'the top crometer ealiper'onth'e like,isaid hub having a longitudinal series of graduations, and a thim-ble mountedfor rotation on tlleillub hiu ing an annular series of graduationsextend.

ing toone edge, of a "position indicator in- Q ding a resilient*splitTing gripping the hub and adjustable longitudinally of the hub by the rotation of the thimble thereagainst,

, said: ring aflfo'rdi'ngja limited resistance. to the movement of the thimble, a tongue at one end i v of the ring, a head at the other end of the ring, one edge ofthehead 'constituting a meansiforzengagement by the said edge of the thimble, there being a longitudinal groove in "the hub, andmeans on the tongue forsliding engagement with the groove tohold the positionindioator against rotation;

In testimony that 'I'claimthe foregoing as Lmyov'vn, I-have'hereto afiixed-mysignature. l

renoRe -lMUB-nooK. 

